You want to store the number of files in your home directory in a variable file_count. Which command correctly uses command substitution to do this?

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Bash Scripting - Quoting and Expansion

You want to store the number of files in your home directory in a variable file_count. Which command correctly uses command substitution to do this?

Afile_count=$(ls ~ | wc -l)

Bfile_count=`ls ~ wc -l`

Cfile_count=$(ls ~ wc -l)

Dfile_count=ls ~ | wc -l

Step-by-Step Solution

Solution:

Step 1: Understand the command to count files
To count files, we list them with ls ~ and pipe to wc -l to count lines (files).
Step 2: Use correct command substitution syntax
file_count=$(ls ~ | wc -l) correctly uses $(ls ~ | wc -l) to run the full command and store output in file_count. The other options miss the pipe or fail to use command substitution.
Final Answer:
file_count=$(ls ~ | wc -l) -> Option A
Quick Check:
Use $() with full command and pipe inside [OK]

Quick Trick: Use $() with full command including pipes for substitution [OK]

Common Mistakes:

MISTAKES

Missing pipe between commands
Using backticks without pipe
Assigning command without substitution

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More Bash Scripting Quizzes

You want to store the number of files in your home directory in a variable file_count. Which command correctly uses command substitution to do this?

Step 1: Understand the command to count files

Step 2: Use correct command substitution syntax

Final Answer:

Quick Check:

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